✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range — Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
Physics values are plausible (1000g same mass, 19.3 vs 13.0 g/cm³, correct volumes) but water level rise is arbitrarily scaled (pixels_per_cm³ conversion is ad-hoc) and splash particles are incorrectly appended only to the left SVG regardless of which crown; no genuine fall animation (crowns teleport via slider, no timed drop sequence).
Physics values are plausible (1000g same mass, 19.3 vs 13.0 g/cm³, correct volumes) but water level rise is arbitrarily scaled (pixels_per_cm³ conversion is ad-hoc) and splash particles are incorrectly appended only to the left SVG regardless of which crown; no genuine fall animation (crowns teleport via slider, no timed drop sequence).